Nuclear explosions are big. Really damn big. Have you looked at footage of underground nuclear tests?

This was a tiny little 1.2 kiloton bomb under 60 feet of packed soil. Silos aren't packed soil, and though the details are classified, I believe most bombs on ICBMs are somewhere in the megatonish range.

As pointed out elsewhere, silos are heavily-reinforced concrete. You'd have a gun barrel effect directing the blast straight up.

Further, the typical warhead on an American Peacemaker ICBM is a 300kt W87. Granted, there may be up to ten of them, but unless they exploded simultaneously, the detonation would destroy the other nine.

Whether he meant it this way or not, he's actually correct: the probability does increase with time, insofar as mechanical parts wear out over time, electrical parts reach the end of their service lives, metals reach stress and fatigue limits, etc.

The damage done by a wind turbine falling over, or solar panel slipping off a roof tends to be orders of magnitude less serious than a major nuclear accident. That's why wind farms and solar installations can get insurance, and nuclear can't.

Wind also kills birds. Solar requires rare earth elements that are toxic to mine, refine, and dispose of at the end of the panel's life. The damages involved are more than just "[object] falls over."

No, he'd win it. Even if the engine immediately went to zero thrust, the other engine would still be sufficient to find a suitable landing field. In fact, such things are practiced regularly, both simulated (for large jets) and in real life (smaller aircraft). It'd be expensive to fix, but entirely survivable, given a suitably-competent pilot.

"Just that simple"? You like the idea of closing borders, evidently, but do you like the idea of produce prices, meat prices, service-economy costs, and just about every other menial-labor field seeing its labor costs double overnight? Because that's the consequence of requiring that citizens do those jobs. Stoop work is awful, backbreaking work that pays bullshit. It only survives because the immigrants who do it are so desperate for the work that they'll take it.

And if at the same time we close the borders, we cut welfare benefits, so that the lazy who vote for a living have to actually work for a change, what would that do for the labor pool?